The APA4838 is a monolithic integrated circuit, which provides DC volume control, and a stereo bridged audio power amplifiers capable of producing 2.8W (2.3W) into 3W with less than 10% (1.0%) THD+N. APA4838 includes a DC volume control, stereo bridge-tied and single-ended audio power amplifiers, stereo docking outputs, and a selectable gain control, that makes it optimally fittable for notebook PC, multimedia monitors, and other portable applications. The attenuator range of the volume control in APA4838 is from 0dB (DC_Vol=0.8VDD ) to –78dB (DC_Vol=0V) with 31 steps. Both of the depop circuitry and the thermal shutdown protection circuitry are integrated in APA4838, that reduces pops and clicks noise during power up or shutdown mode operation, and protects the chip from being destroyed by over temperature failure. To simplify the audio system design, APA4838 combines a stereo bridge-tied loads (BTL) mode for speaker drive and a stereo single-end (SE) mode for headphone drive into a single chip, where both modes are easily switched by the HP Sense input control pin signal. Besides the low supply current design to increase the efficiency of the amplifiers, APA4838 also features a shutdown function which keeps the supply current only 0.7µA (typ).